Zelab Center-EDI Ultra Pure Water System

Overview

The Zelab Center-EDI Ultra Pure Water System is an integrated, multi-stage laboratory water purification platform engineered for continuous, on-demand production of Type I ultrapure water per ASTM D1193, ISO 3696, CLSI EP21-A, USP , and EP 2.2.43 standards. It utilizes a rigorously validated dual-stage reverse osmosis (RO) pretreatment train followed by electrodeionization (EDI) and final polishing through ultraviolet (UV) oxidation, ultrafiltration (UF), and submicron filtration to achieve consistent 18.2 MΩ·cm resistivity at 25 °C, TOC <3 ppb, endotoxin <0.001 EU/mL, and microbial levels <0.001 CFU/mL. Designed for high-throughput core labs, QC/QA environments, and life science applications requiring stringent water purity—including HPLC, LC-MS, cell culture, molecular biology, and trace elemental analysis—the system draws feed water directly from municipal potable supplies (5–45 °C, 1.0–4.0 kgf/cm² pressure) and delivers stable output across variable inlet conditions via real-time conductivity and resistivity feedback control.

Key Features

• 7-inch full-color capacitive touchscreen with animated menu navigation and intuitive finger-touch interface for system configuration, status monitoring, and alarm management
• Dual-pump, dual-membrane RO architecture with intermediate storage tank—optimized for energy efficiency, reduced wastewater ratio, and enhanced rejection stability (Dow FilmTec™ RO membranes, >99% salt rejection)
• Proprietary EDI module incorporating nuclear-grade ion exchange resins (Dow Optipore™) enabling continuous deionization without chemical regeneration and maintaining ≥10 MΩ·cm DI water at <30 ppb TOC
• Three-point real-time water quality monitoring: feed water, RO permeate, and final UP water—displayed simultaneously without manual sampling
• Dual precision dispensing modes: volumetric (10–999,999 mL) and resistivity-triggered (0–18.25 MΩ·cm), supporting automated protocol-driven delivery
• Onboard data logging via USB and SD card—stores 12 months of timestamped operational history including flow rates, resistivity/TOC trends, alarm events, and consumable usage
• GLP-compliant design: password-protected dual-access control (factory + user), audit-trail enabled event logging, NSF-certified quick-connect fluidic pathways, and corrosion-resistant engineering-grade polymer chassis
• Modular three-door architecture facilitating rapid, tool-free access to prefiltration, RO, EDI, and polishing modules; removable spill tray prevents cross-contamination and simplifies maintenance
• Integrated dual-storage system: 20 L PE non-leaching reservoir + 20 L pressurized stainless-steel tank—eliminates external footprint while ensuring stable supply pressure
• Full-system sanitization protocols: programmable UV/UF loop disinfection, outlet-specific sterilization, tank refilling, and manual drain sequences; automated RO membrane antiscalant flush (configurable interval/duration)

Sample Compatibility & Compliance

The Center-EDI system is validated for compatibility with analytical instrumentation requiring ultrapure water inputs, including but not limited to ICP-MS, GC-MS, ELISA plate washers, and automated DNA sequencers. All wetted materials—including PES 0.2 µm terminal filters, 5,000 Da MWCO UF membranes, and dual-wavelength (254/185 nm) low-pressure UV lamps—meet USP and ISO 10993 biocompatibility requirements. The system conforms to GLP/GMP documentation standards with full traceability of calibration records, maintenance logs, and consumable lifecycles. Optional configurations support additional purity specifications: endotoxin-free (Center-EDI-F), low-TOC (Center-EDI-V), or combined endotoxin/RNase/DNase removal (Center-EDI-FV), each certified per relevant pharmacopeial monographs.

Software & Data Management

Embedded firmware supports comprehensive data governance in regulated environments. All operational parameters—including source water conductivity, RO rejection rate, EDI current draw, UV intensity decay, and final resistivity—are logged with UTC timestamps and retained for ≥12 months. Data export via USB adheres to FDA 21 CFR Part 11 principles: electronic signatures, user authentication, and immutable audit trails. System alerts are categorized by severity (warning, error, critical) and include automatic notification of cartridge exhaustion, parameter excursions, and maintenance deadlines. Remote diagnostics capability enables predictive service scheduling based on cumulative runtime metrics and performance degradation modeling.

Applications

This system serves as the primary water source for laboratories performing high-sensitivity assays where background contamination compromises validity: preparation of mobile phases for UHPLC and HPLC-MS, diluent formulation for trace metal analysis (ICP-OES/ICP-MS), reagent-grade water for PCR master mixes and CRISPR workflows, buffer preparation for electrophysiology and patch-clamp studies, and final rinse water for semiconductor wafer cleaning. Its modular scalability—from 45 L/h to 90 L/h RO output—and configurable polishing stages ensure adaptability across academic, clinical, and industrial QA settings governed by CAP, CLIA, or ISO/IEC 17025 accreditation requirements.

FAQ

What is the maximum achievable TOC level for the Center-EDI-FV configuration?

The Center-EDI-FV model consistently delivers ultrapure water with TOC ≤3 ppb, verified by onboard UV-based online TOC sensor and confirmed via offline HPIC analysis per ASTM D5542.

Does the system support integration with building-wide water monitoring networks?

Yes—via optional Ethernet or RS485 Modbus RTU interface, enabling centralized telemetry of resistivity, flow, and alarm status into LIMS or SCADA platforms.

How often must the EDI module be replaced under typical lab usage?

Under standard municipal feed water conditions (TDS <200 ppm), the EDI stack exhibits a service life exceeding 36 months with scheduled preventive maintenance every 6 months.

Is validation documentation provided for GMP compliance?

Zelab supplies IQ/OQ documentation packages, including test protocols, acceptance criteria, and executed reports compliant with Annex 15 and WHO TRS 986, available upon order confirmation.

Can the system operate unattended overnight?

Yes—the auto-restart function resumes normal operation after power interruption, and programmable standby/sleep mode reduces energy consumption during idle periods without compromising water quality integrity.